Official Measurements Of A Little League Baseball Diamond

For most kids, a backyard baseball game might simply involve plopping down four bases a decent distance apart and using a paper plate to mark the pitcher's location. And although you can play the game quite well on this rudimentary field, the rules become much stricter if you play in a Little League baseball organization. In fact, the Little League organization sets forth precise official measurements of a Little League baseball diamond.

Bases

On a Little League baseball diamond, the distance between each base is exactly 60 feet. Furthermore, the distance between first base and third base is 84 feet 10.25 inches, which is also the same distance between home base and second base. An arc with a radius of 8 or 9 feet surrounds around each base. On most Little League baseball fields, the first base line and third base line are surrounded by grass on both sides. In these cases, the dirt path between the bases must be at least 3 feet wide. Using the front of the pitcher's rubber as the starting point, an arc with a radius of 50 feet should extend from one foul line to the other. This arc represents the meeting point of the dirt infield with the grass outfield. No grass should extend beyond this line into the infield.

Outfield

Two white foul lines begin at the outside edges of home plate and extend until they hit the fence that encloses the entire baseball field. Ideally, a tall pole should be mounted where each foul lines meets the wall. The distance between the tip of home base and the foul pole must be at least 200 feet, although some fields might use a longer distance. Although the Little League organization recommends an outfield fence length of at least 180 feet, the rule is not as strict as the infield rules. In fact, the Sports KnowHow website explains that most Little League baseball fields use fences that are shorter or longer than the 180-feet recommendation.

Home Plate and Pitcher's Mound

The dimensions used at home plate are actually quite complex and require extremely specific measurements. The first base line and third base line meet behind the home base point. The angle where these two lines meet must be 90 degrees. One batter's box sits to the left of home plate, while another batter's box sits to the right. The boxes are separated by 25 inches. Each box measures 3 feet wide and 6 feet long, with the halfway point falling exactly at the tip of home base. Using the tip of home plate as the center, a circle is drawn around home plate with a radius of 9 feet. The distance from the tip of home plate to the pitcher's rubber is 46 feet. The pitcher's rubber should be 18 inches long. Using the midpoint of the pitcher's rubber as the center, a circle is drawn around the pitcher's mound with a radius of 6 feet.

Fun Fact

Interestingly, the Baseball Rules website acknowledges that the dirt and grass used in the baseball diamond are not actually required by Little League official rules. Typically, Little League organizations use the two materials as a convenience to players and to make the field more visually appealing to spectators.